Pickling and passivation of carbon steel

First. the passivation of carbon steel pipes

Passivation is an anti-corrosion treatment method for the surface of carbon steel pipes. The main goal is to form a stable and dense oxide film on the surface of the pipeline, which can effectively prevent further erosion of the corrodible medium on the pipeline. The passivated carbon steel pipe has the characteristics of anti-corrosion, anti-oxidation, anti-wear and anti-corrosion. However, compared with pickling treatment, its corrosion protection ability is relatively weak.

Second. carbon steel pipe pickling treatment

Pickling is the carbon steel pipe into the acid, through a chemical reaction to remove the surface of the pipe iron oxide, and the formation of iron oxide salts from the iron. After pickling, the surface of the carbon steel pipe becomes smooth and has strong corrosion resistance and high temperature resistance. Therefore, in the case of conveying corrosive or high temperature media, pickling of carbon steel pipes is more advantageous.

Third. the choice of carbon steel pipeline treatment

For the same carbon steel pipe, the choice of which treatment method needs to be determined according to its use. If carbon steel pipes are used to transport media with high water quality requirements such as drinking water, passivation treatment should be selected to ensure the safety of water quality; For the transmission of oil, natural gas and other corrosive media, you should choose pickling treatment to ensure the corrosion resistance and high temperature resistance of the pipeline. When choosing the treatment method, it is also necessary to make comprehensive consideration according to the actual situation to achieve the best treatment effect.